The epidermis does not possess sanguineous vases, because if in it had vases would be more subjects to be parasitada by microorganisms therefore is in this place that concentrates the nutrients. The nutrients and oxignio arrive at the epidermis for diffusion from sanguineous vases of derme. The epidermis presents some layers. The origin of the cellular multiplication is the basal layer. All the others are constituted of differentiated cells each time more than, with the basal growth, they go being each time more peripheral. The basal layer, is deepest, in contact with derme, constituted of cubical cells little differentiated that if divide continuously, giving to origin to all the other layers.
It contains little queratina very. Some of these cells are differentiated and passed to the layers most superficial, while others remain in basal layer and continues if to divide. They start to form cellular junctions ones with the others, as desmossomas. They are gifts in the skin without pilosos folculos (skin glabra). – Crnea Layer: constituted of flattened cells eosinfilas without nucleus (deceased) with great amount of filaments, mainly queratinas. – The junction between the epidermis and derme has form of papilas, that they give to greater faying surface de with derme and greater resistance to the attrition of the skin. Derme is colgenas and the intermediate, composed elastic staple fibre layer that gives sustentation to the skin and, still sanguineous vases, nerves, and hipoderme that it is the deep layer, composed of fat, that assists in the regulation of the body temperature. Derme is formed by fabric conjunctive, composed for some types of cells and staple fibres and for a basic substance that fills the cracks between these elements. Between the cells, the fibroblastos, that if put in charge of the production them staple fibres and the extracellular matrix, even so others important exist equally very, as macrophages, pertaining cells endowed with mobility to the imunitrio system with the mission to eliminate the microorganisms, that eventually can have fond of derme, and to devorarem the remaining cells deceased and residues.